/*
 * This file is part of the TREZOR project, https://trezor.io/
 *
 * Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.com>
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "buttons.h"

struct buttonState button;
bool simulateButtonPress = false;
int buttonPressType;

#if !EMULATOR
uint16_t buttonRead(void)
{
    return gpio_port_read(BTN_PORT);
}
#endif

void buttonUpdate()
{
    uint16_t state;
    static uint16_t last_state = BTN_PIN_YES | BTN_PIN_NO;

    state = buttonRead();

    if ((state & BTN_PIN_YES) == 0) {          // Yes button is down
        if ((last_state & BTN_PIN_YES) == 0) { // last Yes was down
            if (button.YesDown < 2000000000) button.YesDown++;
            button.YesUp = false;
        } else { // last Yes was up
            button.YesDown = 0;
            button.YesUp = false;
        }
    } else {                                   // Yes button is up
        if ((last_state & BTN_PIN_YES) == 0) { // last Yes was down
            button.YesDown = 0;
            button.YesUp = true;
        } else { // last Yes was up
            button.YesDown = 0;
            button.YesUp = false;
        }
    }

    if ((state & BTN_PIN_NO) == 0) {          // No button is down
        if ((last_state & BTN_PIN_NO) == 0) { // last No was down
            if (button.NoDown < 2000000000) button.NoDown++;
            button.NoUp = false;
        } else { // last No was up
            button.NoDown = 0;
            button.NoUp = false;
        }
    } else {                                  // No button is up
        if ((last_state & BTN_PIN_NO) == 0) { // last No was down
            button.NoDown = 0;
            button.NoUp = true;
        } else { // last No was up
            button.NoDown = 0;
            button.NoUp = false;
        }
    }

#if EMULATOR
    if (simulateButtonPress) {             /// If a fake button press event is detected, override button state
        if (buttonPressType == BTN_LEFT) { /// Press NO
            button.NoDown = 0;
            button.NoUp = true;
        } else if (buttonPressType == BTN_RIGHT) { /// Press YES
            button.YesDown = 0;
            button.YesUp = true;
        } else if (buttonPressType == BTN_LEFT_RIGHT) { /// Press BOTH
            button.NoDown = 0;
            button.NoUp = true;
            button.YesDown = 0;
            button.YesUp = true;
        }
    } //*/
#endif

    last_state = state;
}
